I played in two events - Welcome to the Sixth World (teaching my daughter the game) and the Shadowrun LARP. Company Men is being run at a local convention over Labor Day weekend, which is why I didn't sign up for more events.
The Welcome to the Sixth World I played (run by some guy with the initials T.P.) was fun, and my daughter had a good time as well. I wonder if the format could use to be tweaked, though - it seemed people were more interested in jumping in and experiencing the game than spending two hours in character creation. A two hour slot where you can jump in with a pregen and carry the Karma / Nuyen rewards over when you make a Missions character would be an interesting experiment.
The Shadowrun LARP was fun, and I was able to team up with a good group. However, it is apparent that either I fail at LARPing, or the Nuyen reward was subpar. When handed the summary sheet, I realized that I didn't do anything to help with most of the objectives (and wasn't even aware of some of them, like Valentine). After dividing our Nuyen cards among the group, I earned a grand total of 1100 Nuyen for a 4 hour event. For comparison, I earned 5000 nuyen for Welcome to the Sixth World, where the adventure only took half that time. From a money perspective, I would have been better off traveling between NPCs for four hours, buying and selling dwarf beards*...

My suggestion for the LARP would be to give a starting task to the characters for some initial direction and a passable payout, then let the PCs use the hooks from that starting task to move to the more freeform style that we saw at this year's GenCon. That way, inexperienced LARPers won't feel like they missed out on the plotline.
* That was our best payout of the game - we bought a dwarf beard from Carver for 1000 nuyen, then turned around and sold it to the Ancients ganger for 5000 nuyen. 5 minutes of work resulted in a 4000 nuyen profit for our team.
EDIT: Here's our team for the LARP
https://plus.google.com/photos/116342043345797559643/albums/6050394844707721393?authkey=CKL1i4PRzOKmqgE